Packing.



N. B. MILLER.

PACKlNG.

APPLICATION FILED APR.'i.\3t1.

May 9, 1916.

Patented I l/VVE/WUR WITNESSES 3:5 2. m 1.4. W by A TTORNE Y NORMAN B. MILLER, OF HADDON HEIGHTS, NEW JERSEY PACKING.

Specification of Letters Patent.

Patented May 9, 1916.

Application filed April 1, 1914. Serial No. 828,999.

T 0 all whom it may concern Be it known that I, NORMAN BRUCE M11 LER, a citizen of the United States, and resident of the town of Haddon Heights, county of Camden, State of New Jersey, have invented certain new and useful Improvements in Packings, of which the following is a specification.

This invention relates to what is ordinarily termed piston packings. The somewhat elastic and usually fibrous rings placed in stuffing boxes, to be compressed by the box to a more or less firm-impingement upon the piston rod which passes through the box.

It has been found that it is particularly difficult to so confine the packing that no leak will take place around the piston rod and it is my belief that this is so because the great friction to which a packing is subjected by the rapidly moving rod wears the packing thereby requiring constant re-adustment thereof in lieu of which a leak is bound to occur.

In designing this packing I have had in mind to reduce a packing that is in itself highly e cient and particularly satisfactory for all purposes and I have added to my packing certain improvements that tend to obviate the wear to increase the lubrication and to materially add to the efiiciency and rapid adjustment of the packing. The construction and other advantages to be derived therefrom together with the operation will be set forth as the specification progresses.

The'following is what I consider the best means of carrying out this invention.

The accompanying drawings form a part of this specification, in which:

Figure 1 shows in section a stuiiing box, a piston rod passing therethrough and my packing in operable position therein. Fig. 2 shows a section of my packing. This and the remaining figures are on a larger scale. Fig. 3 shows a section of packing of somewhat different construction the use of which would obtain certain of the advantages of my invention. Fig. 4 is a section through a packing formed in two parts but so con structed as to obtain the advantages of my invention and other advantages to be described later.

Similar reference numerals indicate like parts in all the figures where they appear.

This packing thatI have designed is construct ed of alternate layers of rubber or other suitable resilient and semi-plastic material combined under pressure with certain layers of canvas or duck. In producing my packing I arrange that the canvas shall be molded in or otherwise combined with the plastic and resilient material in such a manner that the canvas-will be impregnated with the plastic material and the whole will have the effect of being formed integral.

At 1, I have shown a section packing, 2 indicates the plastic material and the dotted lines 3 ndicate canvas or other fibrous material inserted for the purpose of increasing the stability and compression strength of the packing. It will be noted that my packmg is oblong in section and that the upper corners 4 and 5 are rounded, the face is however cut or trimmed so that this face shall be straight and smooth. In the lower face (i of my packing I produce an upwardly extending aperture or cavity 7 this cavity cuts awayrthe portion of the canvas and plastic material and produces a centrally disposed trough through the full length on my pack mg. In practice I line this trough as shown at 8, with rubber or other waterproof material and I arrange that the top of the trough shall not extend above the compression ,line w-a, the line above which the force will be applied when the packing is compressed in a stuffing box.

l hen my packing is complete as shown and before it is inserted into the sufiing box I may fill the cavity 7 with a lubricating material such as grease, graphite or a combination of grease and graphite or with any other suitable lubricant. This having been accomplished the packing is cut or coiled, and then cut to form the proper number of rings. This packing may be inserted either as a ring packing or a spiral packing it requiring no more careful attention in fitting than any ordinary soft packing. After being cut to. fit the packing is placed in position and the gland or stufling box is adjusted so that the packing is compresed to a desirable degree. It will be found that my packing maybe caused toimpinge upon the rod with greater firmness than is possible with ordinary packing because the self lubrirating qualities reduce the friction to a minimum.

Thus far I have described the filling of the trough or cavity 7 with a lubricant before the packing is placed in position. In

operation however I have found that a most peculiar condition arises that 1s, that it' oil is used as the lubr cant to wet the packing with oil before it is of the {packing allowing placed in position then during the operation of the piston the oil fed to the cylinder through an ordinary lubricator will gather in the recess in my packing filling the recess and remaining as an the'piston rod; r

In Figs. 3 and 4 I show other means for accomplishing the desirable results and for obtaining the recess or cavity into which the lubricating material is to be received. in Fig. 3 this means consists of cutting away a portion of'theouter edgesas indicated at 9 and 10 but I prefer if this is done that the facings of the cuts be .covered with rubber or other suitable material. Now when two rings of packing are placed side by side the result will be a liberal V shaped space well .adaptedto receive any suitable.

lubricant. At Figs 4, I show how it is posit is only necessaijv efficient lubrication tor said packing as herein specified March, i914.

departing from the principle or sacrificing 3 the advantages of this invention.

Having carefully and fully described, my invention what Iclaim and desire to secure by Letters Patent is z- I 1. A packing of resilient material having a channel formed therein for the reception 'and temporary retention of a lubricant and a waterprmif shield within said channel to retain the lubricant away from said packing.

2. A packingof resilient and fibrous ma terial formed in layers and arched. said packing being provided with an open recess extending inward to an extentless than onehalt the thickness of the packing and wholly away from the pressure receiving portion of and for the purpose set forth. 3. flexible packing the entire cross section of which 'is arched and in layers and having both ends of each layer upon the same plane said packing being provided with a centrally disposed space or cavity ex tendinginward to an extent substantially interior to the pressure receiving portion ol said packing and into which lubricating material may collect for the purpose set forth.

Signed at New York city. in the county and State of New York this 18th day of p N. B. MlLLER.

\Vitnesses w i i (i. E. S'rnmn'rrn, L. C. FRAKER. 

